UPDATE 2-Logitech buys LifeSize Comms for $405 mln

* Buy bolsters position in video conferencing market

* Deal to be neutral to slightly positive from 2011

* LifeSize sees sales up 40-60 pct in 2010

* Shares rise 2 pct

(Adds shares, analyst comment, background)

By Katie Reid

ZURICH, Nov 11 (Reuters) - Logitech (LOGN.VX) said it is buying privately held LifeSize Communications for $405 million, bolstering its position in the much-prized video communication market, which is seen as a key source of future growth.

LifeSize Communications has more than 9,000 video conferencing customers, Logitech -- the world's largest computer mouse maker -- said late on Tuesday.

"We expect this acquisition to extend our leadership in video communication beyond the desktop," Logitech Chief Executive Gerald Quindlen said.